<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false">
            </el-alert>
            <!-- 步骤条组件 -->
            <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center="">
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">

                <!-- tab栏区域 -->
                <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader v-model="addForm.goods_cat" :options="catelist" :props="cateProps" @change="handleChange"></el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的item项 -->
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                            <!-- 复选框组 -->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- action表示图片要上传到的后台API地址 -->
                        <el-upload :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture" :headers="headersObj" :on-success="handleSuccess">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器 -->
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                        <el-button type="primary" class="btnAdd" v-on:click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>
        <!-- 图片预览 -->
        <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
            <img :src="previewPath" alt="">
        </el-dialog>
    </div>
</template>
    

<script>
export default {
    data () {
        return {
            activeIndex: '0',
            // 商品分类列表
            catelist: [],
            // 添加商品的表单数据对象
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                // 商品所属分类数组
                goods_cat: [],
                // 图片的数组
                pics: [],
                // 商品的详情描述
                goods_introduce: '',
                attrs: []
            },
            cateProps: {
                expandTrigger: 'hover',
                label: 'cat_name',
                value: 'cat_id',
                children: 'children'
            },
            addFormRules: {
                goods_name: [{ required: true, message: '请输入商品名称', trigger: 'blur' }],
                goods_price: [{ required: true, message: '请输入商品价格', trigger: 'blur' }],
                goods_weight: [{ required: true, message: '请输入商品重量', trigger: 'blur' }],
                goods_number: [{ required: true, message: '请输入商品数量', trigger: 'blur' }],
                goods_cat: [{ required: true, message: '请选择商品分类', trigger: 'blur' }],

            },
            // 动态参数列表数据
            manyTableData: [],
            // 静态参数列表数据
            onlyTableData: [],
            // 上传图片的URL地址
            uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
            // 图片上传组件的headers请求头对象
            headersObj: {
                Authorization: window.sessionStorage.getItem('token')
            },
            // 图片的绝对路径
            previewPath: '',
            // 控制预览图片对话框显示/隐藏
            previewVisible: false
        }
    },
    created () {
        this.getCateList()
    },
    methods: {
        // 获取所有商品分类数据
        async getCateList () {
            const { data: res } = await this.$http.get('categories')
            if (res.meta.status !== 200) {
                return this.$message.error('获取商品分类数据失败!')
            }
            this.catelist = res.data
        },
        // 级联选择器选中项变化时触发
        handleChange () {
            if (this.addForm.goods_cat.length !== 3) {
                this.addForm.goods_cat = []
            }
        },
        // 切换标签页时触发
        beforeTabLeave (activceName, oldActivcName) {
            // 即将离开的标签页的名字oldActivcName
            // 即将进入的标签页的名字activceName
            if (oldActivcName === '0' && this.addForm.goods_cat.length !== 3) {
                this.$message.error('请先选择商品分类!')
                return false
            }
        },
        // tab 被选中时触发
        async tabClicked () {
            // 证明访问的是动态参数面板
            if (this.activeIndex === '1') {
                const { data: res } = await this.$http.get(`categories/${this.addForm.goods_cat[2]}/attributes`, { params: { sel: 'many' } })
                if (res.meta.status !== 200) {
                    return this.$message.error('获取动态参数列表失败!')
                }
                // console.log(res.data);
                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(',')
                });
                this.manyTableData = res.data
                // 证明访问的是静态属性面板
            } else if (this.activeIndex === '2') {
                const { data: res } = await this.$http.get(`categories/${this.addForm.goods_cat[2]}/attributes`, { params: { sel: 'only' } })
                if (res.meta.status !== 200) {
                    return this.$message.error('获取静态属性列表失败!')
                }
                this.onlyTableData = res.data
            }
        },
        // 处理移除图片的操作
        handleRemove (file) {
            // 1.获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path
            // 2.从pice数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.indexOf(filePath)
            // 3.调用数组的sploce方法，把图片信息对象，从pice数组中移除
            this.addForm.pics.splice(i, 1)
        },
        // 监听图片上传成功的事件
        handleSuccess (response) {
            // console.log(response);
            // 1.拼接得到一个图片信息对象
            const picInfo = { pic: response.data.tmp_path }
            // 2.将图片信息对象，push到pice数组中
            this.addForm.pics.push(picInfo)
        },
        // 预览图片事件
        handlePreview (file) {
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        // 添加商品
        add () {
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) {
                    return this.$message.error('请填写必要的表单项!')
                }
                // 执行添加的业务逻辑 
                const form = JSON.parse(JSON.stringify(this.addForm))
                form.goods_cat = form.goods_cat.join(',')
                // 处理动态参数
                this.manyTableData.forEach(item => {
                    const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals.join(',') }
                    this.addForm.attrs.push(newInfo)
                })
                // 处理静态属性
                this.onlyTableData.forEach(item => {
                    const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs
                // console.log(form);

                // 发起请求添加商品(商品名称必须是唯一的)
                const { data: res } = await this.$http.post('goods', form)
                if (res.meta.status !== 201) {
                    return this.$message.error('添加商品失败!')
                }
                this.$router.push('/goods')
                return this.$message.success('添加商品成功!')

            })
        }

    }
}
</script>

<style lang="less" scoped>
.el-steps {
    margin-top: 15px;
}
.el-checkbox {
    margin: 5px 0 0 0;
}
img {
    width: 100%;
}
.btnAdd {
    margin-top: 14px;
}
</style>